Plumbing vent cap



FIG. 1 is a top perspective view of a plumbing vent cap embodying my design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top plan view, the opposite side being a mirror image thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a plumbing vent cap, as shown and described. 